How Ancient Humans Slept at -35°C Without FREEZING

30,000 years ago, entire families slept on the Siberian steppe with -35°C outside. They weren't stronger than you. Their bodies were physiologically identical to yours. So how did they survive every single night? The answer isn't resistance. It's engineering. In this video you'll discover the complete system prehistoric humans developed to sleep without dying in the most extreme cold in human history — including the archaeological discovery at Mezhyrich, Ukraine, where structures built from 950 mammoth bones were found. What you'll learn: → Why caves were NOT the universal solution → How frozen ground was used as a thermal battery → The mammoth bone dome: architecture 30,000 years ago → The moss-based humidity control system that modern industry still hasn't fully replicated → The passive ventilation that applied fluid physics with zero formal engineering → How they survived psychologically through months confined in the same space The principles they discovered are still present today: geothermy, multi-layer insulation, passive ventilation, bioclimatic architecture. The materials changed. The laws of physics did not.